Bulk nickel-based chromium and phosphorous bearing metallic glasses

Patent metadata

Field	Value
Publication number	US-9920410-B2
Application number	US-201514797878-A
Country	US
Kind code	B2
Filing date	Jul 13, 2015
Priority date	Aug 22, 2011
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

Ni-based Cr- and P-bearing alloys that can from centimeter-thick amorphous articles are provided. Within the family of alloys, millimeter-thick bulk-glassy articles can undergo macroscopic plastic bending under load without fracturing catastrophically.

First claim

What is claimed is:

1. An alloy represented by the following formula:
Ni (69−w−x−y−z) Cr 8.5+w Nb 3+x P 16.5+y B 3+z ,

where w, x, y, and z are positive or negative atomic percentages that satisfy the condition:
0.0494 w 2 +1.78 x 2 +4 y 2 +z 2 <1, and

wherein the critical rod diameter of the alloy is at least 5 mm.

2. The alloy of claim 1 , wherein up to 1.5 atomic % of Nb is substituted by materials selected from the group consisting of Ta, V, or combinations thereof.

3. The alloy of claim 1 , wherein up to 2 atomic % of Cr is substituted by Fe, Co, Mn, W, Mo, Ru, Re, Cu, Pd, Pt, Ti, Zr, Hf, or combinations thereof.

4. The alloy of claim 1 , wherein up to 2 atomic % of Ni is substituted by Fe, Co, Mn, W, Mo, Ru, Re, Cu, Pd, Pt, Ti, Zr, Hf, or combinations thereof.

5. A metallic glass comprising an alloy where a composition of the alloy is represented by the following formula:
Ni (69−w−x−y−z) Cr 8.5+w Nb 3+x P 16.5+y B 3+z ,

where w, x, y, and z are positive or negative atomic percentages that satisfy the condition:
0.0494 w 2 +1.78 x 2 +4 y 2 + z 2 <1, and

wherein the critical rod diameter of the alloy is at least 5 mm.

6. The metallic glass of claim 5 , wherein up to 1.5 atomic % of Nb is substituted by materials selected from the group consisting of Ta, V, or combinations thereof.

7. The metallic glass of claim 5 , wherein up to 2 atomic % of Cr is substituted by Fe, Co, Mn, W, Mo, Ru, Re, Cu, Pd, Pt, Ti, Zr, Hf, or combinations thereof.

8. The metallic glass of claim 5 , wherein up to 2 atomic % of Ni is substituted by Fe, Co, Mn, W, Mo, Ru, Re, Cu, Pd, Pt, Ti, Zr, Hf, or combinations thereof.

9. The metallic glass alloy of claim 5 , wherein the stress intensity at crack initiation K Q , when measured on a 3 mm diameter rod containing a notch with length between 1 and 2 mm and root radius between 0.1 and 0.15 mm, is at least 60 MPa m 1/2 .

10. The metallic glass alloy of claim 5 , wherein a rod formed of the alloy having a diameter of at least 0.5 mm can undergo macroscopic plastic bending under load without fracturing catastrophically.

11. The metallic glass alloy of claim 5 , wherein the compressive yield strength, σ y , obtained using the 0.2% proof stress criterion is greater than 2000 MPa.

12. The metallic glass alloy of claim 5 , wherein the Poisson's ratio is at least 0.35.

13. The metallic glass of claim 5 , wherein the corrosion rate in 6M HCl is not more than 0.01 mm/year.

14. A method of producing a metallic glass comprising:
melting an alloy into a molten state; where the alloy has a composition represented by the following formula:
Ni (69−w−x−y−z) Cr 8.5+w Nb 3+x P 16.5+y B 3+z ,

where w, x, y, and z are positive or negative atomic percentages that satisfy the condition:
0.0494 w 2 +1.78 x 2 +4 y 2 + z 2 <1; and
quenching the melt at a cooling rate sufficiently rapid to prevent crystallization of the alloy.

15. The method of claim 14 , wherein the temperature of the molten alloy is raised to 1100° C. or higher prior to quenching below the glass transition to form a glass.

16. The method of claim 14 , wherein the temperature of the molten alloy is between 1150° C. and 1250° C.

17. The method of claim 14 , further comprising fluxing the melt with a reducing agent prior to quenching.

18. The method of claim 17 , wherein the reducing agent is boron oxide.

Assignees

• California Inst Of Techn

Inventors

• Na Jong Hyun
• Demetriou Marios D
• Johnson William L
• Garrett Glenn

Classifications

• C22C1/11

  Making amorphous alloys · CPC title

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title

• C22F1/002

  by rapid cooling or quenching; cooling agents used therefor · CPC title

• C22C1/023

  Alloys based on nickel · CPC title

• C22C45/04 Primary

  with nickel or cobalt as the major constituent · CPC title